Lifting jack



`Eune 20, 1939.A D. J. BlssELL `LIFTNG JACK Filed Aug. 16, 1935 i lll-n I I nventor Attorney mentes June 2o, 1939 l UNITED STATES PA'rlazN'r4 ori-lcs 5 Claims.

My present invention relates to improvements in lifting jacks and while the improvements may be embodied in various types vof jacks, I prefer to utilize them in connection with the well known type of telescoping, pneumatic jack that is generally employed for the purpose of lifting automotive vehicles in order that access may be had to parts of the vehicle for repairs, or for inspection. As is well known, when lifting the vehicle with jacks now in use, diiliculty` is frequently encountered by the mechanic, and others, in locating the jack in proper position for safe and reliable use, because of obstructions presented by the springs, axles, and other parts of the underrigging of the vehicle.

To overcome these diiculties I provide the jack with an exterior bracket that is reversible for use, and adjustable, with relation to the jack, to provide for clearance in adjusting the jack for use under the vehicle; and my invention consists in certain novel combinations and arrangements of the jack and its bracket as will hereinafter be more fully set forth and claimed.

In the accompanying drawing I have illustrated one example of the physical embodiment of my invention, wherein the bracket is combined and arranged for use with a telescoping, pneumatic, jack, but it will be understood that changes and alterations may be made in this exemplifying structure, within the scope of my claims, without departing from the principles of my invention.

Figure 1 is a view in .elevation of the improved jack, in position and ready for use, with the bracket down and detachably connected with the spring and the axle of a vehicle.

Figure 2 is an enlarged detail view partly in elevation and partly in section of the jack and bracket, with the latter in reversed position, i. e. in the up position as distinguished from the position of the bracket in Figure 1.

Figure 3 is a top view of the jack showing the bracket arm and its angular relation to the jackv and tothe clamp device of the bracket.

In Figure 1 Where I have illustrated one way of using the bracket preparatory to operating the jack I have indicated an automotive wheel as W, the spring as S, and the axle as A, and the jack is supported with the bracket arm under the spring and on top of the axle, in order that the pneumatic jack may be extended and its base 'I supported on the floor or ground, and thus utilized in lifting the body or chassis of the vehicle.

In carrying out my invention I combine and (Cl. 25d-86) use the bracket with the exterior'cylinder or barrel i oi a jack, and this cylinder is fashioned with exterior screw threads, which extend upwardly from the lower end of the cylinder to near the upper end of the cylinder. It will be under- 5 stood that the bracket may be mounted on or attached to various types or kinds of jacks oi which the exterior cylinder has the threads 2 or other means for mounting the bracket on the cylinder.

As best illustrated in Figure 2 this particular telescoping, pneumatic jack has two telescoping tubular sections 3 and I within the exterior cylinder, and these sections have an open-center piston head 5 and a closed piston head 6, respectively, while the innermost lsection l is provided with a usual base 1 to take the load borne by the jack when in use. y

The top head 8 of the exterior cylinder is provided with an inlet connection or xture 9 for the introduction oi' motive fluid, as air under pressure, for extending the telescoping parts of the jack, and a lateral port-xture is indicated at III as a return air-connection for the exterior cylinder.

The bracket is preferably a one-piece structure having a laterally extending plate or flat arm Ii, and as best seen in Figure 3, this arm has angular, converging edges i2 and I3 which come to a substantial point at its free end. These angular edges readily lend themselves to Vfreedom in use and facile adjustment with relation to various parts of the vehicle, as indicated in Figure 3 where the bracket arm is engaged with the spring S; and the arm also may be provided with holes il adapting it for use with various tools or devices when attaching the bracket arm to a part of the vehicle.

The bracket arm is rigid with, or integral with a cylindrical collar, sleeve, or bushing I5, that is interiorly threaded and thus adapted to be mounted on, and turned on, the exteriorly threaded cylinder of the jack, thus providing for an adjustment of the bracket throughout the substantial length of the jack-cylinder I.

As may be observed in Figures 1 and 2 the bracket may be mounted on the jack with the arm down, or with the arm up, the former position providing for a longer stroke of the jack,- and the latter providing for a shorter stroke of the jack.

To facilitate adjustment of the bracket on the cylinder and to provide means for rigidly iixing the bracket on the jack in adjusted position, the bushing l5 is split, and the adjoining edges of 2 aieaeei the split bushing are provided with perforated ears or flanges it and l1 in which a clamp bolt i8 is mounted, and the clamp nut i9 is employed for rigidly clamping the bushing on the cylinder l to prevent relative rotary movement between the bushing and the cylinder of the jack.

As shown in Figure 2, the bushing is fashioned with slots 20 so placed that the attachment for the return air pipe I0 may readily be made through a slot that registers with the port in the cylinder l. Y

The bracket arm and the ears IS-l'l project radially from the bushing, but the bushing is at one side of the axial line of the arm, so that whether the arm is down as in Figure l, or up as in Figure 2, the ears or anges with the clamp bolt and nut, are readily accessible, but out of the way of interfering parts of the vehicle. After the bracket is adjusted to the desired position and clamped tightly 'on the cylinder, the bracket of course moves up or down, as the case may be, with the cylinder, and the bracket provides an essential auxiliary in the operation of the jack.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

l. The combination in a portable lifting jack having a supporting base and a movable jackcylinder having exterior threads, and means for lifting the cylinder, of a rotatively adjustable bracket movable longitudinally of the cylinder and comprising a split bushing threaded on the cylinder and means for clamping the bushing in place, and a bracket arm rigid with the bushing.

2. The combination in a portable lifting jack having a supporting base and an adjustable jackcylinder having exterior threads, of a. rotatively adjustable bracket movable longitudinally of the cylinder and comprising a split bushing threaded on the cylinder, said bushing having a pair of perforated ears, a clamp bolt mounted in the ears and a nut for the bolt, and a laterally extending bracket arm integral with the bushing. A

3. The combination in a portable lifting jack having a supporting base and an exteriorly threaded adjustable cylinder, of a rotatively adjustable bracket movable longitudinally of the cylinder and comprising a split-bushing and an integral arm projecting laterally from one end of the bushing, said arm having a pair of converging edges at its free end and said bushing having interior threads for co-action with the threaded cylinder, a pair of integral perforated ears projecting from the bushing on a line disposed at an angle to the longitudinal axis of the arm, and a clamp bolt and nut mounted in said ears.

4. The combination in a portable lifting jack base and an interior fixed scopic jack-cylinder mounted on the intermedi ate section and provided with exterior screw threads, of a rotatively adjustable bracket movable longitudinally of the jack cylinder and comprising a cylindrical bushing threaded on the jack cylinder, and a bracket arm rigid with the bushing.

5. The combination in a portable lifting jack with a supporting base and its fixed interior section, an intermediate telescopic tubular section fixed section, and a telescopic jack cylinder mounted on the intermediate section and 'provided with exterior screw threads, of a rotatively adjustable bracket movable longitudinally of the jack cylinder and comprising a split cylindrical bushing threaded on the jack cylinder, a bracket arm rigid with the bushing, perforated ears on the split bushing, and a clamp bolt mounted in said ears.

DAVID J. BISSELL. 

